Dolph Ziggler. If they really wanna test him as a big star, they'll give him the WWE Title. Sure he's in line to be WHC, but since the WHC is obviously lesser than the WWE Title, he's only going to be in the same spot that he's been in for the past few years.

Past his prime now, but it's still a shame he only held the #1 title once.

Yeah but Jericho past his prime is still awesome!
If the question is who would make the best champion NOW then it's gotta be Y2J but Daniel Bryan, Ziggler, a heel Sheamus and The Miz would all make great champions. Hell, Daniel Bryan as WWE champ in feuds with CM Punk, Ziggler, Y2J et al would be amazing.

Daniel Bryan has that unique ability to connect with the fans AND be the best in the ring. That match with Rey the other night really showed that Bryan is the actual "Best in the World". Having him as the face of the company would mean the WWE is back to promoting "Wrestling". If the WWE brass would allow him to embrace the "YES" chants, we would see one of the most over Champions since the Attitude era.

Yeah, I love Ziggler, but I'm more a fan of his ability to sell moves rather than his actual wrestling prowess. I think Ziggler is the best seller in the business, today. But, Bryan is on a tier of his own when it comes to mat wrestling.